VAMP Ltd Generator protection relay
Technical description
VAMP 210
VM210.EN004 Vamp 24h support phone: +358 (0)20 753 3264
25
Figure 2.2.9-1 Overload protection.
Parameters of the overload protection:
T> (49)
Parameter: Value/unit:
Measured
value
Temp % Temperature rise
Display T> A Setting value T>
T> k x In Setting value T>
Alarm % Alarm setting T>
Setting
values
tau min
Heating/cooling time constant
[min]
SCntr Cumulative start counter Recorded
values
TCntr Cumulative trip counter
2.2.10. Underexcitation protection (40)
The underexcitation protection protects the generator and the
power system against loss of synchronism. When the generator
produces capacitive power, that is when the reactive component
of the power vector is negative, the excitation current can be so
low, that the synchronism is lost.
The measurement of the degree of excitation is based on a
complex three-phase power vector, which is calculated from the
fundamental components of the phase currents and phase-to-
phase voltages.
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